2 problems

Let $M$ and $\hat M$ be generic mirror Calabi–Yau $3$-folds. Suppose there exist special Lagrangian fibrations … Let $\Delta_f\subset B$ and $\Delta_{\hat f}\subset\hat B$ be their…

Let $V_k$ be the locus of cubic surfaces for which the matrix $M$ has rank at most $20-k$, and let $N_2$ denote the locus of binodal cubic surfaces. The $19\times 19$ minors of $M$…